e1608: cosmetic minors -- 2-digit frequency spin, smaller mock catch-up cap, docs wording

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/claude/probe-readings.md

@@ -1875,8 +1875,8 @@ The UDPS run has no `source-` page in `side_stack`, because the UDPS kind has no
 
 `UDPSCOPE_PROBE_E1608=1500` (the first eight lines; `frames=` and the exact mean vary) and
 `UDPSCOPE_PROBE_E1608_RECONNECT=8000` (the last two) run as `--source e1608` against `tools/mock_e1608.py`
-with the options in `verification.md`. The ninth line is the source's own stderr message about the drop, not a
-probe line (its text is the error the source met, once per distinct message). `connected=0` throughout, with
+with the options in `verification.md`. The line between `decode` and `reconnect` is the source's own stderr message
+about the drop, not a probe line (its text is the error the source met, once per distinct message). `connected=0` throughout, with
 `actions: skipped (not connected)`, is the no-board run; it is a reading and not a failure, and it also prints
 the one `[e1608] handshake with ...: Connection refused` line, `stream: ... signals=0 expect=1 ... ok=0`,
 `calibration: ai0_mean=nan ... ok=0` and `state: connects=0 message='handshake with ...'`.